Remove constraints from a segment. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- iSegment
 -  Type:  System Int32  
Index of the segment (0 to NumberOfSegments - 1). 
- paramId
 -  Type:  Autodesk.Revit.DB ElementId  
Id of a parameter driving one or more constraints. 
Remarks
 This reverses the effect of any AddConstraint and SetSegmentAs180DegreeBend operations involving the specified segment and parameter. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | iSegment is not between 0 and NumberOfSegments. -or- paramId is not the id of a shared parameter in the current document, or its unit type is not UT_Reinforcement_Length or UT_Angle. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |